Um Jammer LAAAAAA-MMMMY! Addictive and fun!
You play as Lammy, a guitar playing member of the band Milkcan. You need to press buttons along with the quirky songs to play guitar and get yourself out of some creative situations, like taking care of a wailing baby and putting out a burning building.
I really like the stylized graphics and the catchy songs. They aren't as endearing or as haunting as Parappa's, but you can tell that the game designers really put a lot of creativity and care into them.